Are you using the 3G on your phone or WiFi? If you're using 3G, then it's possible that you aren't able to connect because your router firewall isn't configured to allow the connection.
Have you tried connecting to Subsonic from a computer outside your network?
If you want to check if the port is forwarded, you can use this tool. Just change the port number to the port Subsonic is running on.
www.yougetsignal.com/tools/open-ports/
If it's not open, you'll have to find out how to forward it. If you have no idea where to begin, start by replying and giving us your router's model number. Maybe someone here will be able to assist you. If you have some idea what you're doing but need a guide, go to Port Forward.com and look up your router.
Cheers,
Kirk